This may be because you download your Tamagotchi. Each day you do that, your Tama's life cycle goes back in time. In other words, everything get delayed.
Bell Sprout is right, also both pets must have been an adult for more than 24 hours. If they aren't nothing will happen. Believe me, I know from experience!
Good luck...
It may be because you accidentally have the clock set at the wrong time and your pet thinks it's time to go to bed. However, I've also heard that Tamagotchis sometimes just have naps for no reason...
I have come across a number of different rumors or 'tricks' for Tamagotchi V.2 and simply have no idea which ones are true and which ones are not. Here is a list of the some of the things I've heard:
1. If you buy the Throne and let your Furwatchi sit on it, the pet will evolved into a...